/// <summary>
/// Reads the current chunk and creates a runtime type for it, which is then returned.
/// </summary>
/// <param name="context">The context of the chunk file being read. Must not be null.</param>
/// <returns>Returns null if there was no runtime type found for the current chunk.</returns>
public override object Read(ChunkFileContext context)
{
Check.IfArgumentNull(context, nameof(context));
Check.IfArgumentNull(context.ChunkStack, nameof(context.ChunkStack));
Check.IfArgumentNull(context.ChunkStack.CurrentChunk, nameof(context.ChunkStack.CurrentChunk));
Check.IfArgumentNull(context.ChunkFile, nameof(context.ChunkFile));
Check.IfArgumentNull(context.ChunkFile.BaseStream, nameof(context.ChunkFile.BaseStream));
var reader = context.Services.GetService <FileChunkReader>();
var stream = context.ChunkFile.BaseStream;
var chunk = context.ChunkStack.CurrentChunk;
chunk.RuntimeInstance = reader.ReadRuntimeChunkType(stream, chunk.ChunkId);
// extra check if type returned is correct for chunk.
if (chunk.RuntimeInstance != null &&
!ChunkAttribute.GetChunkId(chunk.RuntimeInstance).MatchesWith(chunk.ChunkId.ToString()))
{
var msg = String.Format(
CultureInfo.InvariantCulture,
"The type '{0}' tagged with '{1}' was returned when '{2}' was requested.",
chunk.RuntimeInstance.GetType(),
ChunkAttribute.GetChunkId(chunk.RuntimeInstance),
chunk.ChunkId);
throw new ChunkFileException(msg);
}
return(chunk.RuntimeInstance);
}
public ChunkFileContextBuilder AddChunk(Type chunkType)
{
var chunkId = ChunkAttribute.GetChunkId(chunkType);
if (String.IsNullOrEmpty(chunkId))
{
throw new ArgumentException($"The specified type {chunkType.Name} has no ChunkAttribute.", nameof(chunkType));
}
_chunkTypes.Add(chunkType);
return(this);
}
public FileChunkHeader WriteNextChunk(object chunk)
{
Contract.Requires(chunk != null);
Check.IfArgumentNull(chunk, "chunk");
// find chunk id
var chunkId = ChunkAttribute.GetChunkId(chunk);
if (String.IsNullOrEmpty(chunkId))
{
var msg = String.Format(
CultureInfo.InvariantCulture,
"No Chunk Attribute was found for the specified runtime object of type '{0}'.",
chunk.GetType().FullName);
throw new ArgumentException(msg);
}
if (chunkId.HasWildcard())
{
// TODO: this must be pluggable in some way
// for now only digits
chunkId = chunkId.Merge("0000");
}
var chunkTypeId = new FourCharacterCode(chunkId);
var chunkHandler = this.handlerMgr.GetChunkHandler(chunkTypeId);
if (!chunkHandler.CanWrite(chunk))
{
var msg = String.Format(
CultureInfo.InvariantCulture,
"The chunk handler '{0}' cannot write the specified runtime object.",
chunkHandler.ChunkId);
throw new ArgumentException(msg);
}
int stackPos = this.context.HeaderStack.Count;
var header = this.PushNewHeader(chunkTypeId);
chunkHandler.Write(this.context, chunk);
// wind down the stack to the level it was before we started.
while (this.context.HeaderStack.Count > stackPos)
{
var poppedHeader = this.PopHeader();
this.WriteChunkHeader(poppedHeader);
}
return(header);
}
/// <summary>
/// Scans the <paramref name="assembly"/> for types that have the
/// <see cref="ChunkAttribute"/> applied and adds them to the factory.
/// </summary>
/// <param name="assembly">Must not be null.</param>
/// <param name="replace">If true the Type found in the <paramref name="assembly"/> will replace
/// an already registered type.</param>
public void AddChunksFrom(Assembly assembly, AddMode addMode)
{
Check.IfArgumentNull(assembly, nameof(assembly));
var result = from type in assembly.GetTypes()
where type.IsClass && type.IsChunk()
select new { ChunkId = ChunkAttribute.GetChunkId(type), Type = type };
foreach (var item in result)
{
AddChunkType(item.ChunkId, item.Type, addMode);
}
}
private static string GetCollectionItemChunkId(object instance)
{
Type type = instance.GetType();
Type dataType = null;
if (type.IsGenericType)
{
var genType = type.GetGenericTypeDefinition();
if (genType.FullName.StartsWith("System.Collections.Generic.", StringComparison.OrdinalIgnoreCase) &&
genType.FullName.EndsWith("`1", StringComparison.OrdinalIgnoreCase))
{
dataType = (from typeArg in type.GetGenericArguments()
select typeArg).FirstOrDefault();
}
else
{
var msg = String.Format(
CultureInfo.InvariantCulture,
"The generic type '{0}' is not supported. Use IEnumerable<T> for collections.",
genType.FullName);
throw new NotSupportedException(msg);
}
}
else
{
dataType = type;
}
string chunkId = null;
if (dataType != null)
{
chunkId = ChunkAttribute.GetChunkId(dataType);
}
return(chunkId);
}
public override void Write(ChunkFileContext context, object instance)
{
Check.IfArgumentNull(context, "context");
Check.IfArgumentNull(instance, "instance");
Check.IfArgumentNotOfType <RiffChunk>(instance, "instance");
var chunk = (RiffChunk)instance;
if (chunk.InnerChunk == null)
{
throw new ArgumentException("No RIFF chunk content found.", "instance");
}
// make sure the correct file type is set.
chunk.FileType = new FourCharacterCode(ChunkAttribute.GetChunkId(chunk.InnerChunk));
// write out RIFF file type
base.Write(context, instance);
var writer = context.CompositionContainer.GetService <FileChunkWriter>();
writer.WriteRuntimeChunkType(chunk.InnerChunk);
}
public bool WriteChunkObject(object value)
{
Contract.Requires(value != null);
Check.IfArgumentNull(value, "runtimeObject");
bool isCollection = false;
var type = value.GetType();
if (type.IsGenericType)
{
// use generic parameter as type
type = (from typeArg in type.GetGenericArguments()
select typeArg).FirstOrDefault();
if (type == null)
{
throw new ChunkFileException("Internal error. No type argument from generic type.");
}
isCollection = true;
}
var chunkId = ChunkAttribute.GetChunkId(type);
foreach (var member in this.members)
{
if (member.ChunkMatches(chunkId) &&
member.CanSetValue)
{
member.SetValue(this.Instance, value, isCollection);
return(true);
}
}
return(false);
}
private static IEnumerable <ObjectMemberData> BuildMemberList(Type type)
{
Contract.Requires(type != null);
Check.IfArgumentNull(type, "type");
var members = (from member in type.GetMembers()
where member.MemberType == MemberTypes.Property || member.MemberType == MemberTypes.Field
where member.GetCustomAttributes(typeof(IgnoreAttribute), true).Length == 0
select new ObjectMemberData {
FieldInfo = member as FieldInfo, PropertyInfo = member as PropertyInfo
}).ToList();
foreach (var member in members)
{
Contract.Assume(member != null);
string chunkId = null;
Type dataType = null;
if (member.FieldInfo != null)
{
dataType = member.FieldInfo.FieldType;
}
if (member.PropertyInfo != null)
{
dataType = member.PropertyInfo.PropertyType;
}
Contract.Assume(dataType != null);
if (dataType.IsGenericType)
{
var genType = dataType.GetGenericTypeDefinition();
if (genType.FullName.StartsWith("System.Collections.Generic.", StringComparison.OrdinalIgnoreCase) &&
genType.FullName.EndsWith("`1", StringComparison.OrdinalIgnoreCase))
{
member.DataType = (from typeArg in dataType.GetGenericArguments()
select typeArg).FirstOrDefault();
member.IsCollection = true;
}
else
{
var msg = String.Format(
CultureInfo.InvariantCulture,
"The generic type '{0}' is not supported. Use IEnumerable<T> for collections.",
genType.FullName);
throw new NotSupportedException(msg);
}
}
else
{
member.DataType = dataType;
}
if (member.DataType != null)
{
chunkId = ChunkAttribute.GetChunkId(member.DataType);
}
if (!String.IsNullOrEmpty(chunkId))
{
member.ChunkIds = new List <string>();
member.ChunkIds.Add(chunkId);
}
else
{
var memberInfo = member.GetMemberInfo();
if (memberInfo != null)
{
var chunkTypes = ChunkTypeAttribute.GetChunkTypes(memberInfo);
if (chunkTypes != null && chunkTypes.Length > 0)
{
member.ChunkIds = new List <string>(chunkTypes);
}
member.ChunkIdsAreChunkTypes = true;
}
}
}
return(members);
}
public void AddChunkType(Type chunkType, AddMode addMode)
{
var chunkId = ChunkAttribute.GetChunkId(chunkType);
AddChunkType(chunkId, chunkType, addMode);
}
